CVE-2023-54020
dmaengine: sf-pdma: pdma_desc memory leak fix
- Published
- Updated
- Reserved
- Assigned by
- Linux
Description
In the Linux kernel, the following vulnerability has been resolved: dmaengine: sf-pdma: pdma_desc memory leak fix Commit b2cc5c465c2c ("dmaengine: sf-pdma: Add multithread support for a DMA channel") changed sf_pdma_prep_dma_memcpy() to unconditionally allocate a new sf_pdma_desc each time it is called. The driver previously recycled descs, by checking the in_use flag, only allocating additional descs if the existing one was in use. This logic was removed in commit b2cc5c465c2c ("dmaengine: sf-pdma: Add multithread support for a DMA channel"), but sf_pdma_free_desc() was not changed to handle the new behaviour. As a result, each time sf_pdma_prep_dma_memcpy() is called, the previous descriptor is leaked, over time leading to memory starvation: unreferenced object 0xffffffe008447300 (size 192): comm "irq/39-mchp_dsc", pid 343, jiffies 4294906910 (age 981.200s) hex dump (first 32 bytes): 00 00 00 ff 00 00 00 00 b8 c1 00 00 00 00 00 00 ................ 00 00 70 08 10 00 00 00 00 00 00 c0 00 00 00 00 ..p............. backtrace: [<00000000064a04f4>] kmemleak_alloc+0x1e/0x28 [<00000000018927a7>] kmem_cache_alloc+0x11e/0x178 [<000000002aea8d16>] sf_pdma_prep_dma_memcpy+0x40/0x112 Add the missing kfree() to sf_pdma_free_desc(), and remove the redundant in_use flag.
Scores
No CVSS score yet: neither the CNA, CISA nor NVD has scored this CVE. NVD status: Deferred.
- EPSS (exploitation in 30 days)
- 0.19% · top 91% of all CVEs (6 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Not scored.
Affected products
- affected 5ab2782c944e324008ef5d658f2494a9f0e3c5ac – < ad222c9af25e3f074c180e389b3477dce42afc4f
- affected b2cc5c465c2cb8ab697c3fd6583c614e3f6cfbcc – < 03fece43fa109beba7cc9948c02f5e2d1205d607
- affected b2cc5c465c2cb8ab697c3fd6583c614e3f6cfbcc – < 8bd5040bd43f2b5ba3c898b09a3197a0c7ace126
- affected b2cc5c465c2cb8ab697c3fd6583c614e3f6cfbcc – < b02e07015a5ac7bbc029da931ae17914b8ae0339
- affected b9b4992f897be9b0b9e3a3b956cab6b75ccc3f11
- affected 4c7350b1dd8a192af844de32fc99b9e34c876fda
- affected a93b3f1e11971a91b6441b6d47488f4492cc113f
- affected 5.15.61 – < 5.15.99
- affected 5.10.137 – < 5.11
- affected 5.18.18 – < 5.19
- affected 5.19.2 – < 5.20
- affected 6.0
- unaffected < 6.0
- unaffected 5.15.99 – ≤ 5.15.*
- unaffected 6.1.16 – ≤ 6.1.*
- unaffected 6.2.3 – ≤ 6.2.*
- unaffected 6.3 – ≤ *
References (4)
- https://git.kernel.org/stable/c/ad222c9af25e3f074c180e389b3477dce42afc4f (opens in a new tab)
- https://git.kernel.org/stable/c/03fece43fa109beba7cc9948c02f5e2d1205d607 (opens in a new tab)
- https://git.kernel.org/stable/c/8bd5040bd43f2b5ba3c898b09a3197a0c7ace126 (opens in a new tab)
- https://git.kernel.org/stable/c/b02e07015a5ac7bbc029da931ae17914b8ae0339 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
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[](https://trackcve.app/cve/CVE-2023-54020)Record last updated .